非稳态蠕变裂纹尖端场强度因子的近似解

An Approximate Solution for the Amplitude of Crack Tip Field Under Non-steady Creep

在时间相关比例加载条件下，从幂律蠕变材料静态裂纹体的应力应变场出发，建立了在时间相关比例加载条件下弹性－幂律蠕变材料裂纹体的瞬态Ｊ（ｔ）积分和Ｃ（ｔ）积分的估算公式。作为特例，给出了载荷恒定和加载点位移恒定这两种特殊情况下Ｊ（ｔ）积分和Ｃ（ｔ）积分的解析表达式，并与有限元解进行了比较，其结果吻合良好。

Using the stress and strain fields for the power-law creeping cracked body under time-dependent proportional loading, the approximate estimation formulae for the transient J(t) and C(t) integrals for the elastic-power law creeping cracked body under time-dependent proportional loading are proposed. As special examples,the analytical expressions for the constant applied loading and the constant applied load-line displacment are given.They are consistent with the results of the finite element well.